Data obtained by Air Quality News through a Freedom of Information (FOI) request revealed that in 2019 the London Fire Brigade dealt with just 54 electric vehicle fires compared to 1,898 petrol and diesel fires.
So 1,898 / 38m = .005%
54 / 434,282 = .012%
That shows EVs are 2 x more likely to catch on fire compared to ICE in London. Average age in the UK is 9 years while the average EV is maybe 3. However as more EVs are adopted that percent will grow because of the dendrite problems that plague lithium ion batteries.